A snap hook with spring may include a main body having a first generally curved shape section and a second generally straight shape section. The generally curved section may include a hole, and the generally straight section may include a cavity. The snap hook with spring may also include a sliding pin and a spring acting on said sliding pin. The snap hook with spring may also be characterized in that a slide formed in the main body may have various geometrical shapes leading to a path, where the path includes sections that may be linear, rotational, curved, angular, or any combination thereof. The sliding pin may include a lever that runs the path of the slide and the path of the slide determines the type of movement of the sliding pin, in such a way that the path of the slide is never limited to a single direction.